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COMPUTER: Dell Inspiron 5548 laptop
CPU: Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz
GRAPHICS: Intel-AMD hybrid:
- CPU-integrated: Intel Corporation Broadwell-U Integrated Graphics (driver:
i915)
- GPU: Advanced Micro Devices, Inc. [AMD/ATI] Topaz XT [Radeon R7 M260/M265]
(driver: amdgpu)
OPERATING SYSTEM: 64-bit GNU/Linux XUbuntu 16.04 "Xenial"
KERNEL: 4.4.0-31-generic
PROBLEM: system hangs / freezes very frequently.
I have Xscreensaver installed and noticed that when it's running an OpenGL
animation (screensaver) and I move the touchpad pointer the screen freezes. I
can still turn the keyboard LED backlight on and off (hence: keyboard doesn't
stop working) but the pointer won't move (touchpad is locked) and I can't
Alt-F1 (switch terminals). Only solution is to power off my laptop (press and
hold the power button).
I usually select the "Molecule" screensaver (it uses OpenGL), then I
click the "preview" button and wait for about 20 seconds, then I click
the touchpad and the computer hangs.
When I used XUbuntu 14.04 "Trusty" with AMD's fglrx (proprietary) driver
I didn't experience such issue. After upgrading to 16.04 "Xenial" (which
doesn't support fglrx module/driver) amdgpu module is loaded by default
but very frequently hangs the entire system.
Sometimes I'm quick enough to go to TTYS1 and then I get to see some
messages such as "HARD LOCKUP on CPU0" and "HARD LOCKUP on CPU1".
However, it's not a hardware problem because I've already executed the
Dell Hardware Diagnostics straight from the boot (it's an EFI utility),
it tested all the hardware components (CPU, GPU, RAM, keyboard,
touchpad, hard disk etc.) and didn't detect any faulty component.
The attached file "amdgpu-bug.txt" is the reason why I'm pretty
convinced that the problem is being caused by the amdgpu driver.
WORKAROUND: Boot from GRUB with the nomodeset parameter. The graphics
performance becomes terribly slow.
** Affects: xorg (Ubuntu)
Importance: Low
Status: Incomplete
** Tags: amd64 amdgpu apport-bug apport-collected xenial
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64-bit XUbuntu 16.04 "Xenial" hybrid graphics (Intel + AMD): AMDGPU crashes /
freezes / hangs entire system
https://bugs.launchpad.net/bugs/1608042
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